Before i even vote,how do u vision this without it taking up to much space on your screen? And how about keycombinations for each hotbar?
U can want it,but it has to be do-able without to much issues or complaints

Remember it would be Totally optional to have the extra one. if you need it you use it, if you don't then leave it hidden. The player can decide whether user real estate matter to them. Additionally what can be done is if a 4th row is added reduce the total size that hotbars take up by 10% for each skill.

Before i even vote,how do u vision this without it taking up to much space on your screen? And how about keycombinations for each hotbar?
U can want it,but it has to be do-able without to much issues or complaints

It is already possible to add/hide, drag and change viewing angle of hotbars.
So we can populate slots and hide entire hotbar already.
We can drag them around the screen and just click icons with a mouse if we like to do so.
One possible way is to change Alt + 1 etc. functionality.
Currently it changes hotbars with a locked keys,
but changing hotbars with Alt + 1 etc. so whatever appears in the first/default hotbar, has always 1,2,3....0,-,= keys on it.

have played other games where a combination of skills can be done with 1 spot on hot bar. I agree that extra hot bars would probably take up too much room on the screen, but a combination on the present hot bars would be exceptionally helpful.

Like what jsimpson said - Need a box for skill stacking like we have for pets. Place the skills such as self-buffs in the slots and instead of numerous clicks - one click starts you on your way to self-buff or even helping others with buffing. Kinda like opening Chaos balls. Four clicks too many....